Best Math books?

Hi guys. I'm studying for a degree at the moment, with Games Programming as its major. I was kind of surprised that I got accepted into the course, because I did terribly in math, and didn't actually do Extension Maths...Which was a pre requisite (They said they accepted me because of my Physics)

Anyway, I want to transfer into a Computer Science course next year, and would like to know any recommended reading you guys might know of that will get my math up to speed? I don't even know if my math will be good enough for a year in this course, although I haven't had trouble so far, this is just introductory at the moment...